13866139 has 4 divisors (see below), whose sum is σ = 15847024. Its totient is φ = 11885256.

The previous prime is 13866137. The next prime is 13866173. The reversal of 13866139 is 93166831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93166831 = 47 ⋅1982273.

It is a cyclic number.

It is not a de Polignac number, because 13866139 - 2¹ = 13866137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13866098 and 13866107.

It is not an unprimeable number, because it can be changed into a prime (13866133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990432 + ... + 990445.

It is an arithmetic number, because the mean of its divisors is an integer number (3961756).

Almost surely, 2^13866139 is an apocalyptic number.

13866139 is a deficient number, since it is larger than the sum of its proper divisors (1980885).

13866139 is an equidigital number, since it uses as much as digits as its factorization.

13866139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980884.

The product of its digits is 23328, while the sum is 37.

The square root of 13866139 is about 3723.7264937157. The cubic root of 13866139 is about 240.2436125905.

The spelling of 13866139 in words is "thirteen million, eight hundred sixty-six thousand, one hundred thirty-nine".